The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 01, 2025
Filed:
Oct. 28, 2021
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Daisuke Sato, Osaka, JP;
Abstract
A motor driver includes an operation clock generator, a PWM signal detector that detects a PWM signal indicating a target rotation speed input from an outside in a first cycle based on a clock from the operation clock generator, a target rotation speed converter that converts a duty ratio of the detected PWM signal into the target rotation speed, a rotation speed controller that drives the motor so that an actual rotation speed of the motor matches the target rotation speed, a trigger value calculator that calculates a second cycle based on a difference between a cycle of the PWM signal and the first cycle, and a timer that generates a trigger signal in the calculated second cycle. The rotation speed controller calculates the actual rotation speed depending on the second cycle of the trigger signal generated by the timer.